oe birmingham



March 9 ,1926. 1,575,873

' C. M G. SYKES SEMIAUTOMATIC WEIGHING APPARATUS F l May- 21. 1924 2 Sheets-Sheet 1 fmrenloli- QzmeronM as has 5y '3! 2- its ornqy Man-c119 ,1926.

c. we. SYKES SEMIAUTOMATI C WEIGHING APPARATUS Filed May 21, 1924 2 Sheets-Shea}. '2

i l k A q [inventor-- Patented Mar. 9, 1926.

UNETED STATES PATENT QFFEQE.

CAMERON MCGBEGOR SYKES, OF BIRMINGHAM, ENGLAND, ASSIGNOR TO W. 86 T. AVERY, LIMITED, 013 BIRMINGHAM, ENGLAND.

SEMIAUTOMATIC WEIGHING API?ARATUS.

Application filed. May 21,

To all whom it may concern:

Be it known that CAMERON MoGnEcon SYKns, a subject of he King of Great Britain, residing at Soho Foundry, Birmingham, England, has invented a new and useful Improvement in Semiautomatic \Veighing Apparatus; and he does hereby declare the following to be a full, clear, and exact description of the same.

This invention has reference to improvements in semi-automatic dial Weighing mechanism and relates specifically to weighing mechanism of the kind described and claimed in the specification of my pending application, Serial No. 558989 filed May 6th, 1922.

in weighing mechanism of this kind a steelyard and poise weight mechanism is combined with a dial indicator and the load is. initially automatically balanced by a spring resistant which automatically determines the position of an indicator utilized in connection with the positioning of the poise weight the load being subsequently balanced as to its major order by the steelyard and poise weight mechanism and as to its minor order automatically by a pendulous resistant.

The present invention has for its object improvements in the construction and arrangement of weighing mechanism of the aforesaid kind.

The invention consists of a weighing mechanism of the aforesaid kind wherein the pointer for indicating the minor order of weighment is fixed to a lever which is connected to a motion damping device, said lever cooperating with an overbalanced lever connected to the steelyard, said steelyard being fulcrumed in a swinging shackle and provided with a pendulous resistant. The invention also resides in the improved construction of a weighing mechanism of the aforesaid character.

The invention will now be described with particular reference to the accompanying "drawings, in which Fig. l is a part'sectional'front elevation of that part of the weighing mechanism which embodies the features of the present" invention.

Fig. 2 is a sectional end elevation taken onthe line 22 Figure 1 looking in the direction of th T i r i a 1924. Serial No. 714,898.

Fig. 3 is a plan taken on the line 33 of Figure l.

The platform or weighbridge to which the load is to be applied is connected in the ordinary manner to a connecting rod 4. This connecting rod at is suspended by a shackle 5 from the center knife-edge 6 of an intermediate lever 7, this lever in turn being suspended at one end by means of a shackle 8, rod 9 and shackle 10 from the back knife-- edge 11 of a steelyard 12 and at the other end by means of a shackle 13 from a lever 14:. This lever 14:is fulcrumed by means of a knife-edge 14F on a pedestal 15 mount-ed on the base platc'and is connected by a link 16 to a coil spring 17 which depends from an arm 18 secured to the housing. Attached to the lever 14 is an index pointer 19 which is adapted to register against the chart 20 for a purpose to be hereinafter more fully described.

The spring 17 forms the automatic resistant for any load which is appiied to the weighing mechanism within the capacity thereof and said spring also serves to indicate the required setting of the poise weight 21 on the steelyard 12 as will be described later. The steelyard 12 is fulcrumed by means of the knife-edges 12 upon bearings mounted in a swinging shackle 22 which in turn is mounted by means of knife-edges 22 on bearings formed in a bracket secured to the housing. Secured to the steelyard 12 is a vertical rod 24 which is cranked at its lower end and has attached thereto a screwed spindle 25 on which is adjustably mounted a pendulous weight 26 the vertical axis of the weight being disposed in the plane of the knifeedge 12. An arm 27 is secured to or formed integral with the steelyard 1.2 and this arm27 carries a bar 28 which is disposed parallel to the steelyard said bar 28 being provided with a knife-edge 29 from which depends a rod 30 which is connected at its lower end by-means of a knife-edge 31 to an overbalanced lever 32. This lever 32 is fulcrumed in an extension 33 forming part of the pedestal 15 by means of pins 32 and is formed with a projecting section 32 the upper surface of which is adapted to contact with a pin 34 carried by a bifurcated-lever 35 which. is fulcrumed on knife-edges 36 carried by the extension 33 as is clearly seen in Figure 2; Secured to the lever 35 and symmetrical about the vertical axis of its fulcrum an index pointer 37 which is adapted to traverse and register against a chart 38, said pointer 37 aflording an indication of the minororder of the load in a manner to be described. Screwed rods 44, 45 having pendulous weights :6 47 adjuslably n'lounted thereon are secured to the lever 35 said Weights serving to partially counter anc the minor order of the load transmitter through the steelyard 12.

The major order of the weighment indicated by means of the graduatixms on a plate 39 secured to andtrayersable With .the poise Weight 9.1 as .viewed through an ape-rture 40 formed in the chart 88. The graduations on the plate -39 are co-ondinatled with the graduations of the steelyard. The poise weight mountedon .the steelyard is provided with a nib and is adapted for adjustment in the Well known manner. The free end of the long arm .of the steelyard projects through an aperture in the side Wall of the housing and has motion therein limited by the stops -11, means such as'a tumbler (not shown) being preferably provided to lock the i'steelyard when the same is not in use.

"The motion of the lever 14; is damped by means of the dashpot 4-2 mounted on the pedestal and the motion of the lever 35 by the dashpot -13 mounted on the base of the housing.

' Theoperation of the scale is as follows: Upon the application of a load to the Weighinp; platform the Weight is transmitted throughthe connecting rod 4%. .to the intermediate lever '7 and is .clistributed simultaneously to the spring 1-? and the steelyard 12; the poise Weight being in .the zero position, and the applicatio of the load to the steelyard causes the free ,end thereof to rise until it abuts and is locked against the upper of the stops ll. Meanwhileil the loadis aboiie say one hundredufcight the pointer 37 traverses completely the chart and becomes obsciutel behind the right hand. side of the charthousing, and the knife-edge 11 index pointer 19' attached constitutes a fixed point of suspension for the left hand ot the intermediate lerer 7. The load is thus wholly transmitted to the link 16 thereby extending the spring 1-7 and rocking the lever 14- antl thus Moving the ,to across ib the cha 20 and in the 1.105

rium registe g t a: n 901,1 the chart 20. This marking of e chart 20 corresponds with a designati ,1 f one of the notches of the steelyard; to which notch;

the poise weight 2.2.is'then moued and When in this position completelybal nces thed asto its ma I 'he. spring-17 m the steelyard. in th s fposlt on the graduate-II 9-1. he plate 5 co e p n g t t e not h 13.1 the steel.-

ver le and" resistanta 1 :wilib eai 1 or order and' also transfers the;

yard, an automatic ,resista tained the pendulous Weight 26 which forms part of the steelyard 12 swings outwardly and tends to return ,the steelyard to its horizontal position and thus lowers the arm 27, bar 28 and rod 30 and permits the long arm of the overbalanced lever 32 to fall whereby the projection 32" on the said lever bears ag inst the pin Flisecured to the lever 1 rocks the said lever 35 about its fulcrum until equilib iu n is attained, and since the index pointer 8'" e the said pointer is traeersed across the tace of the chart 38 and indicates thereon the minor order of the load the major order of the load being simul neously indicated through the aperture 410.

It will be seen 5 t in a eighing mechanism constructed in accordance w' h the present invention the pendulous ivpght 26 which pan ia lly counterbalances the minor ),art of the load has only a small are of motion and thereby admits of the easy grading of the chart ,38 giving substantially equal diyisions of the chart forequal increments of load. in add tion the methodot mountmg the lINlGX pointers ad ts ogt a large magnification of the moyement vo't' the counterbalancinganeehanism and atthe same time eliminates the employment of steel ribbons, cam s segments and like devices usually employed in eight indieating mechanism.

Claims:

l. A Weighing mechanism .comprising in combination a' steelyard, a poise Weight mounted on and traversab le along the said ,steelyard, an gil llOllllllC 11c" ant, an indicator connec l tosaid res ant, a chart coy I whereby the e aen T upo each of said .1 means connected .to poise .ufielght for 1; lleating tl or order of the irelgli u nt- -Ww a:

posed in co-relation .nutl i inl 19;; t n m the n; orderof weig l ne vi l p meehen sgm oomp u ng in a1 Queue ea mounted in said housing", l excre ed in. a d. eliee le re s mountedon and tra rsa'blealiong t; aiif'iei s s po n wnaectecl t9 sa ireis attached o the lever 35 ant, a chart dil a i ri co-ordinated with the graduations of the steelyard and adapted to co-operate with said pointer, a pendulous resistant in connection with said steelyard and adapted to counterbalance the minor order of weighment, an index pointer connected to said pendulous resistant, a chart adapted to cooperate with said pointer and adapted to afford an indication of the minor order of weighment, an intermediate lever having connection with the steelyard and the automatic resistant, connecting means between said intermediate lever and the load platform, and means connected to said poise weight for indicating the major order of the weighment the weight indication being disposed in co-relation with the chart for indicating the minor order of weighment.

3. A weighing mechanism comprising in combination a housing, a swinging shackle mounted in said housing, a steelyard mounted in said shackle, a poise weightmounted on and traversable along said steelyard, an automatic resistant. a secondary lever in connection with said resistant, an overbalanced lever connected to said steelyard, a pendulous resistant in connec tion ith said overbalanced lever, an intermediate lever having connection with the steelyard and said secondary lever, an index pointer connected to said secondary lever, a chart adapted to co-operate with said pointer to afford an indication of the required setting of the poise weight to counterbalance the major order of the load, an index pointer connected to said pendulous resistant, a chart adapted to co-operate with said pointer to indicate the minor order of weighment, means for transferring the pull of a load to said intermediate lever, and

means connected to said poise weight for indicating the major order of the weighment the weight indication being disposed in co-relation with the chart for indicating the minor order of weighment.

4. A weighing mechanism comprising in combination a housing, a swinging shackle mounted in said housing, a steelyard mounted in said shackle, a poise weight mounted on and traversable along said steel.- yard, a spring resistant anchored at one end to said housing, a secondary lever connected to the other end of said spring, an over balanced lever, a lever in connection with said overbalanced lever, pendulous resistants connected to the last mentioned lever, connecting means between the overbalanced lever and the steelyard, an index pointer connected to said secondary lever, a chart adapted to co-operate with said pointer to afford an indication of the required setting of the poise weight to counterbalance the major order of weighment, an index pointer connected to said resistant lever, a chart adapted to co-operate with said pointer to afford an indication of the minor order ot weighment, an intermediate lever having connexion with the steelyard and the secondary lever, connecting means for transferring the pull of a load to said intermediate lover, a graduated plate connected to said poise weight and having its graduations co-ordinated with the markings of the steelyard, and means co-operating with said plate to afford an indication of the major order of the load.

In testimony whereof, I have signed my name to this specification.

CAMERON MCGREGOR SYKES. 

